What is Hybrid Concrete Construction?
This method basically involves integration of precast concrete & cast in situ concrete to gain advantage from their diverse intrinsic qualities. The speed, accuracy, and high quality finishing of precast concrete is combined with flexible and economical in situ concrete to produce buildable, simple, yet competitive structures. The construction companies, by employing this construction method, are able to deliver the client a better value product. Increased off-site manufacture, faster and safer construction, and steady performance benefits both the clients and the contractors.
Precast and in situ concrete are used together in several different ways to expand the design horizons for engineers, architects, and contractors. Both these elements can work independently in combination. Moreover, a structure may comprise both precast and cast in-situ concrete working together, compositely. There are numerous types of hybrid precast and cast in-situ systems among with some are widely used.
Advantages of Using Hybrid Concrete Construction
Structural Actions of Hybrid Concrete Construction
- Lower cost of construction
Although the cost of building’s structural frame represents only 10 percent on the total project cost, the materials used for the frame have significant consequences for the following processes. Hybrid concrete construction offers great quality, speed, and reduced overall cost on a project. The use of concrete has many additional benefits in estimating the whole-life costs as well. For example, due to the thermal mass of concrete, energy demands in heating and cooling buildings can be moderated. This factor is important to the building owners, residents, and PFI operators.
- Buildability (or Constructability)
Hybrid concrete construction is used where it is most appropriate. By doing so, construction processes become relatively simple and rational. The use of precast and cast in situ concrete encourages the decisions regarding design and construction to be resolved at the design stage.
Using this construction method also means that a certain percentage of the structural frame is being manufactured by a skilled labour force in a weatherproof factory, which results in faster and better quality construction.
- Increased Safety During Construction
A high percentage of work for hybrid concrete construction is carried out in a precast factory. The use of this method on site helps ensure that all the safety plans are drafted on the merits of individual projects. Hybrid concrete construction can also reduce the chances for accidents by providing work platforms on less cluttered sites.
- High Sustainability of Hybrid Concrete
This type of construction allows to exploit the thermal mass of concrete by uncovering the soffit of precast concrete slabs. This energy storage capacity of the structure can help control temperatures in naturally ventilated, low-energy buildings. The shape and finish of the exposed concrete units also have the ability to reduce noise levels and even the distribution of lightening.
In today’s time, the operational energy of building is far more than that used during its construction, but in case of concrete buildings this might not hold true. It is because concrete buildings use thermal mass which can reduce energy consumption by minimizing the need for air-conditioning. Due to this reason, hybrid concrete construction is the best choice if you want to build an energy-efficient structure.
- Independent Action: It involves precast cladding that adorns in-situ framed buildings. The complicated portions of a structure usually lend themselves to in-situ construction whereas simple and repetitive sections may lend themselves to precast concrete construction.
- Combined Action: In this case precast units replace the in-situ elements directly. For example, hollow core floor units or stair flights within in-situ frames.
- Composite Action: It involves in-situ concrete toppings that are added to precast concrete floors for additional stiffness, strength, and robustness.